DiResta's Cut: Massive Outdoor Chalkboard

Here Jimmy DiResta makes "one of the heaviest things I've ever put together," for what have to be the smallest end-users: He's been hired by a school to create a massive outdoor chalkboard, and he starts from scratch.

There's a good amount of planning required here, with Jimmy figuring out how the massive piece will be temporarily held in place prior to final mounting. Also check out how he improvises an improved look to the unusual-shaped mending plates: